#include <stdio.h>


#define UPPER  100
#define LOWER  0
#define STEP   20

int whileDemo(){

  printf("prectice for 1-3 in page 8\n");

  printf("%5s\t%5s\n", "fahr", "celsuis" );
  float fahr = LOWER;
  while (  fahr  < UPPER){
	
	printf("%5.2f\t%5.2f\n", fahr, 5.0 * (( fahr += STEP) - 32) / 9 );
  }
}
